diff --git a/content/3.defense-systems/butters_gp57r.md b/content/3.defense-systems/butters_gp57r.md
index 1a0b001b85fc2f7b8de811f4be6e6958e6b7fa99..12c3f0dc7be564dba796eb0b7ea5e4af3dc643ec 100644
--- a/content/3.defense-systems/butters_gp57r.md
+++ b/content/3.defense-systems/butters_gp57r.md
@@ -14,11 +14,11 @@ relevantAbstracts:
 
 ## Description
 
-The Butters_gp57r system is encoded in the Butters mycobacterium prophage and has been shown to inhibit rival phage replication <a href='https://ncbi.nlm.nih.gov/protein/YP_009304936.1'>.
+The Butters_gp57r system is encoded in the Butters mycobacterium prophage and has been shown to inhibit rival phage replication [YP_009304936.1](https://ncbi.nlm.nih.gov/protein/YP_009304936.1).
 
 ## Molecular Mechanism
 
-Butters_gp57r is activated post-DNA injeciton and inhibits island3 and other phage DNA amplification. This system may inhibit heterotypic phage infeciton with the HEPN domain <a href='https://ncbi.nlm.nih.gov/protein/YP_009304936.1'>. 
+Butters_gp57r is activated post-DNA injeciton and inhibits island3 and other phage DNA amplification. This system may inhibit heterotypic phage infeciton with the HEPN domain [YP_009304936.1](https://ncbi.nlm.nih.gov/protein/YP_009304936.1). 
 
 ## Example of genomic structure